判断地址为IPV4的正则表达式

以下是正则表达式：

 

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#region //IPV4正则表达式函数 public static bool IsIPv4Address(string ip) {     string pattern = @"^(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9])\.(25[0-5]|2[0-4][0-9]

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1	|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0)\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0)\.(25[0-5]

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|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[0-9])$";             Regex r = new Regex(pattern);             Match m = r.Match(ip);             return m.Success;         }         #endregion

 使用方法：

 

IPHostEntry IpEntry = Dns.GetHostEntry(Dns.GetHostName());

                for (int i = 0; i != IpEntry.AddressList.Length; i++)
                {
                    if (IsIPv4Address(IpEntry.AddressList[i].ToString()))
                    {
                       comboBox1.Items.Add(IpEntry.AddressList[i]);
                    }
                }